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# Hypothesis testing :Proportion

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Need help setting up, solving and understanding this problem:

During the 2004 election year, new polling results were reported daily. In an IBD/TIPP poll of 910 adults, 503 respondents reported that they were optimistic about the national outlook, and The President's leadership index jumped 4.7 points to 55.3.

a. What is the sample proportion of respondents who are optimistic about the national outlook?

b. A campaign manager wants to claim that this poll indicates that the majority of adults are optimistic about the national outlook. Construct a hypothesis test so that rejection of the null hypothesis will permit the conclusion that the proportion optimistic is greater than 50%.

c. Use the polling data to compute the p-value for the hypothesis test in part (b) above. Explain to the manager what this p-value means about the level of significance of the results.

https://brainmass.com/statistics/hypothesis-testing/hypothesis-testing-proportion-138998

#### Solution Preview

Statistics: Hypothesis Testing (Problem has been edited, missing info added)

Need help setting up, solving and understanding this problem:

During the 2004 election year, new polling results were reported daily. In an IBD/TIPP poll of 910 adults, 503 respondents reported that they were optimistic about the national outlook, and The President's leadership index jumped 4.7 points to 55.3.

a. What is the sample proportion of respondents who are optimistic about the national outlook?

The sample proportion is given by =503/910 = 0.5527472

b. A campaign manager wants to claim that this poll indicates that the majority of adults are optimistic about ...

#### Solution Summary

This shows how to set up and solve an example of a hypothesis testing problem.

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